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is controlled by the respective pack valve. The left and right packs are
completely independent. Normally the left pack uses bleed air from engine No.
1 and the right pack uses bleed air from engine No. 2. Cabin altitude can be
maintained at or below 8,000 feet when the aircraft is at maximum certified
ceiling with only one system operating.
>>@ The APU is capable of supplying bleed air for two packs on the
ground only for rapid heating of the cabin, or one pack in flight.
BCD The APU can supply two packs on the ground for all operations.
Most external air carts are capable of supplying adequate bleed air for two pack
operation.
>>@ Two pack operation from a single bleed air source is not
recommended due to excessive bleed requirements. Pack temperature control is
automatic with manual control as a backup.
AIR SYSTEMS
Sec. 6.2 Page 12 737
Rev. 11/15/02 #41 Continental Flight Manual
AIR CONDITIONING SCHEMATIC
RECIRC FAN
CLOSE
OFF OFF
ON ON
1 2
OFF OFF
AUTO AUTO
OPEN
TRIP
RESET
HIGH AUTO HIGH
APU
L PACK ISOLATION
VALVE
BLEED
R PACK
WING
ANTI
ICE
WING
ANTI
ICE
PACK
TRIPOFF
PACK
TRIPOFF
BLEED
TRIP OFF
BLEED
TRIP OFF
AUTO AUTO
COOL COOL
COOL COOL
WARM WARM
WARM WARM
MANUAL MANUAL
MIX
MANIFOLD
TO
COCKPIT
FROM
RECIRC
FAN
TO LEFT
SIDEWALL RISER
LEFT
AIR
COND
PACK
RIGHT
AIR
COND
PACK
GROUND
PRECONDITIONED
AIR CONNECTION
FAN AIR FAN AIR
5th 5th
9th 9th
MODULATING
AND
SHUTOFF VALVE
MODULATING
AND
SHUTOFF VALVE
PRECOOLER
PRECOOLER
OVERBOARD
OVERBOARD
ENGINE
BLEED
VALVE
ENGINE
BLEED
VALVE
GROUND
PNEUMATIC
CONNECTION
PACK
VLV
CONDITION:
ENGINES OPERATING
& SUPPLYING AIR
CONDITIONING PACKS
ISOLATION
VALVE
APU
BLEED
AIR
VALVE
FAN AIR
9th STAGE BLEED
5th STAGE BLEED
PNEUMATIC BLEED
APU
3737703
AIR SYSTEMS
737 Sec. 6.2 Page 13
Flight Manual Continental Rev. 11/15/02 #41
AIRFLOW CONTROL
With both air conditioning pack switches in AUTO and both packs operating, the
packs provide “normal air flow.” However, with one pack not operating, the
other pack automatically switches to “high air flow” to maintain the necessary
ventilation rate. This automatic switching is inhibited when the aircraft is on the
ground, or inflight with the flaps extended, to insure adequate engine power for
single engine operation. Automatic switching to “high air flow” occurs if both
engine bleed air switches are OFF and the APU bleed air switch is ON, regardless
of flap position, air / ground status or number of packs operating.
With the air conditioning pack switch in HIGH, the pack provides “high air flow.”
Additionally, an “APU high air flow” rate is available when the aircraft is on the
ground, the APU bleed air switch is ON and either or both pack switches are
positioned to HIGH. This mode is designed to provide the maximum airflow
when the APU is the only source of bleed air.
AIR MIX VALVES
The two air mix valves for each pack control hot and cold air according to the
setting of the CONT CABIN or PASS CABIN temperature selector. Air that flows
through the cold air mix valve is processed through a cooling cycle and then
combined with hot air flowing from the hot air mix valve.
In the automatic temperature mode, the air mix valves are operated by the
automatic temperature controller. The automatic temperature controller uses
inputs from the respective temperature selector and cabin temperature sensor.
The automatic temperature controller is bypassed when the temperature selector
is positioned to MANUAL.
Anytime the pack valve closes, the air mix valves are driven to the full cold
position automatically. This aids startup of the cooling cycle and prevents
nuisance hot air trips when the pack is turned on.
COOLING CYCLE
The flow through the cooling cycle starts with bleed air passing through a heat
exchanger for cooling. The air then flows to an air cycle machine for
refrigeration and to a water separator which removes moisture. The processed
cold air is then combined with hot air. The conditioned air flows into the mix
manifold and distribution system.
Overheat protection is provided by temperature sensors located in the cooling
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